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-rw-r--r--include/net/gro_cells.h102
1 files changed, 102 insertions, 0 deletions
diff --git a/include/net/gro_cells.h b/include/net/gro_cells.h
new file mode 100644
index 000000000..0f712c0bc
--- /dev/null
+++ b/include/net/gro_cells.h
@@ -0,0 +1,102 @@
+#ifndef _NET_GRO_CELLS_H
+#define _NET_GRO_CELLS_H
+
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+
+struct gro_cell {
+ struct sk_buff_head napi_skbs;
+ struct napi_struct napi;
+};
+
+struct gro_cells {
+ struct gro_cell __percpu *cells;
+};
+
+static inline void gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb)
+{
+ struct gro_cell *cell;
+ struct net_device *dev = skb->dev;
+
+ if (!gcells->cells || skb_cloned(skb) || !(dev->features & NETIF_F_GRO)) {
+ netif_rx(skb);
+ return;
+ }
+
+ cell = this_cpu_ptr(gcells->cells);
+
+ if (skb_queue_len(&cell->napi_skbs) > netdev_max_backlog) {
+ atomic_long_inc(&dev->rx_dropped);
+ kfree_skb(skb);
+ return;
+ }
+
+ /* We run in BH context */
+ spin_lock(&cell->napi_skbs.lock);
+
+ __skb_queue_tail(&cell->napi_skbs, skb);
+ if (skb_queue_len(&cell->napi_skbs) == 1)
+ napi_schedule(&cell->napi);
+
+ spin_unlock(&cell->napi_skbs.lock);
+}
+
+/* called unser BH context */
+static inline int gro_cell_poll(struct napi_struct *napi, int budget)
+{
+ struct gro_cell *cell = container_of(napi, struct gro_cell, napi);
+ struct sk_buff *skb;
+ int work_done = 0;
+
+ spin_lock(&cell->napi_skbs.lock);
+ while (work_done < budget) {
+ skb = __skb_dequeue(&cell->napi_skbs);
+ if (!skb)
+ break;
+ spin_unlock(&cell->napi_skbs.lock);
+ napi_gro_receive(napi, skb);
+ work_done++;
+ spin_lock(&cell->napi_skbs.lock);
+ }
+
+ if (work_done < budget)
+ napi_complete(napi);
+ spin_unlock(&cell->napi_skbs.lock);
+ return work_done;
+}
+
+static inline int gro_cells_init(struct gro_cells *gcells, struct net_device *dev)
+{
+ int i;
+
+ gcells->cells = alloc_percpu(struct gro_cell);
+ if (!gcells->cells)
+ return -ENOMEM;
+
+ for_each_possible_cpu(i) {
+ struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
+
+ skb_queue_head_init(&cell->napi_skbs);
+ netif_napi_add(dev, &cell->napi, gro_cell_poll, 64);
+ napi_enable(&cell->napi);
+ }
+ return 0;
+}
+
+static inline void gro_cells_destroy(struct gro_cells *gcells)
+{
+ int i;
+
+ if (!gcells->cells)
+ return;
+ for_each_possible_cpu(i) {
+ struct gro_cell *cell = per_cpu_ptr(gcells->cells, i);
+ netif_napi_del(&cell->napi);
+ skb_queue_purge(&cell->napi_skbs);
+ }
+ free_percpu(gcells->cells);
+ gcells->cells = NULL;
+}
+
+#endif